Thermal regulator for a printing form laid about a printing form cylinder for anaqueous offset printing

Abstract

In order to create a thermal regulator for a printing form (2) for anaqueous offset printing, a blast box (3) is provided for the blowing of the printing form (2) with tempered air, in which fans (4) and a cooler (5) are mounted, which is supplied from outside with a coolant (7) from a cooling installation (6), the cooling of the cooler (5) being regulated in dependence on a temperature of a regulator (8).

What is claimed is: 
     
       1. In an anaqueous offset printing system having a printing form on a form cylinder journalled for rotation on an offset printing press, a printing form thermal regulator system, comprising: a blast box mounted on the printing press and located directly proximate the form cylinder, said blast box having one or more blast opening means for directing an air flow onto the printing form, said blast box being of compact construction and said opening means extending over substantially the entire width of the form cylinder, said blast box having at least one fan means within the box for forcing air out through said opening means, an air cooler means within the box located in between the fan means and the blast opening means for tempering the air generated by the fan means, means outside said box for supplying fluid coolant to the cooler means, and temperature regulator means for regulating cooling by the tempered air. 
     
     
       2. In the anaqueous offset printing system of claim 1 wherein said cooler includes a cooling hose, said means for supplying fluid coolant includes a moistening water cooling apparatus disposed outside said blast box and having a water in-flow line and a water out-flow line, and means for connecting said cooling hose to said water in-flow and out-flow lines. 
     
     
       3. In the anaqueous offset printing system of claim 2 wherein said regulator means includes a thermostatically controllable choke valve disposed in the water out-flow line of the water cooling apparatus for regulating the cooling of the directed air in dependence on the temperature of the fluid coolant.